I am not sure how possible this is but I am looking for either midwoofer or full range suitable for small sealed enclosure of around 1/2 ft^3 (15L). Hoping for sensitivity in the high 80s and useful output down the 40s. (F3 in the 50s) Possible?
Very possible
Here is a sim of the Faital Pro 12XL1200 in a 15L sealed box with a Linkwitz Transform (F0=77Hz, Q0=0.642, Fp=52Hz, Qp=0.707).
F3=53Hz, F6=40Hz and F10=30Hz.
Sensitivity of 85dB (light blue curve):
115dB @ 1500W:
.
The grey line in the graph above is max SPL at Xmax limit. As you can see, it exceeds Xmax below 48Hz but, as you can see even better below, excursion stays below 16mm (+30%) and well below Xmech of 24mm so I wouldn't worry about a HPF, especially at these frequencies where you won't be acutely sensitive to distorsion.
If you were to up the power to 2800W, the woofer's maximum power handling, you would gain about 2dB (117dB), exceed Xmax below 60Hz and have max excursion of 22mm (still below Xmech).
If you don't need 115dB and would prefer a bit more extension instead, you would just lower the Fp in the LWT. For example, lowering to 40Hz would give you 110dB, F3=41Hz, F6=31Hz and F10=23Hz.
I doubt those puny 6.5" woofers would give you the same result 😛
Here is a sim of the Faital Pro 12XL1200 in a 15L sealed box with a Linkwitz Transform (F0=77Hz, Q0=0.642, Fp=52Hz, Qp=0.707).
F3=53Hz, F6=40Hz and F10=30Hz.
Sensitivity of 85dB (light blue curve):
An externally hosted image should be here but it was not working when we last tested it.
115dB @ 1500W:
.
An externally hosted image should be here but it was not working when we last tested it.
The grey line in the graph above is max SPL at Xmax limit. As you can see, it exceeds Xmax below 48Hz but, as you can see even better below, excursion stays below 16mm (+30%) and well below Xmech of 24mm so I wouldn't worry about a HPF, especially at these frequencies where you won't be acutely sensitive to distorsion.
An externally hosted image should be here but it was not working when we last tested it.
If you were to up the power to 2800W, the woofer's maximum power handling, you would gain about 2dB (117dB), exceed Xmax below 60Hz and have max excursion of 22mm (still below Xmech).
If you don't need 115dB and would prefer a bit more extension instead, you would just lower the Fp in the LWT. For example, lowering to 40Hz would give you 110dB, F3=41Hz, F6=31Hz and F10=23Hz.
I doubt those puny 6.5" woofers would give you the same result 😛
I will check out these drivers but another possible approach occurs to me.
The application is a luggable system with the loudspeaker boxes semi-hard wired to the amp. I had envisioned an optional separate subwoofer system anyway so perhaps an integrated approach might be good.
I could use as the main driver an even more efficient driver that doesn't need to go as low to get the most out of the lower power tube amp and include a higher power SS amp in the main amplifier box just for driving less efficient woofers that can do the low bass in a small box.
The application is a luggable system with the loudspeaker boxes semi-hard wired to the amp. I had envisioned an optional separate subwoofer system anyway so perhaps an integrated approach might be good.
I could use as the main driver an even more efficient driver that doesn't need to go as low to get the most out of the lower power tube amp and include a higher power SS amp in the main amplifier box just for driving less efficient woofers that can do the low bass in a small box.
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